Electric bell having hinged movement about hanger hook



H. E. SEATON 3,392,383

July 9, 1968 ELECTRIC BELL HAVING HINGED MOVEMENT ABOUT HANGER HOOK 4Sheets-Sheet 1 Filed D80. 20, 1965 fzaerzl or flzzrod 7 feazolz,

July 9, 1968 H. E. SEATON 3, ,383

ELECTRIC BELL HAVING HINGED MOVEMENT ABOUT HANGER HOOK Filed Dec. 20.1965 I 4 Sheets-Sheet 2 H. E. SEATON July 9, 1968 ELECTRIC BELL HAVINGHINGED MOVEMENT ABOUT HANGER HOOK 4 Sheets-Sheet 3 Filed Dec.

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United States Patent 3,392,383 ELECTRIC BELL HAVING HINGED MOVEMENTABOUT HANGER HOOK Harold E. Seaton, Shelby, Ohio, assignor to TheAutocall Company, Shelby, Ohio, a corporation of Ohio Filed Dec. 20,1965, Ser. No. 514,791 16 Claims. (Cl. 340396) ABSTRACT OF THEDISCLOSURE A large electric bell of the fire, school or industrialvariety is disclosed. The bell is hinged at the top of the mountingplate and the gong encloses the striker mechanism.

The present invention relates to electric bells, such as fire bells,school bells, industrial bells and the like. As is well known in theart, these electric bell assemblies comprise solenoids or likeelectromagnetic devices, together with plunger or striker unitsresponsive thereto for striking the bells.

One of the features of the invention is the provision of a new andimproved construction of carrier element for carrying the solenoid andalso carrying the plunger. In this regard, another feature of theconstruction is a new and improved mounting or guiding rib means andassociated numerical scale for adjusting the solenoid and plungerassembly relatively to the gong for adjusting the loudness or tone ofthe gong, and also for adjusting for different sizes of gongs; as willbe later described in greater detail.

Another feature of the invention is the provision of a new and improvedconstruction and location of locking mechanism which makes it impossiblefor the housing and gong to become accidentally loosened from therearwardly disposed anchorage plate which carries the housing and gong.Many large size gongs create relatively severe vibration during theirsounding operation, and instances have occurred in which the housing andgong have become loosened and have fallen from elevated positions, withresultant serious damage.

Another feature is the provision of new and improved constructions whichcan operate under alternating current energization, or under directcurrent energization.

Another feature is a new and improved construction of alternatingcurrent bell which utilizes a permanent magnet in its operation. Theinvention also provides an alternating current bell which does notutilize a permanent magnet in its operation.

Another feature is a new and improved construction of single strokealternating current bell which will sound only one stroke when the bellis energized. Another feature characterizing this single strokealternating current bell is that this bell will give this single strokeperformance irrespective of whether the bell is mounted with the plungerfacing horizontally, vertically, obliquely, or at any other angle.

Another feature is an improved construction which is rainproof,snowproof and moisture-proof. This is attained by a unique relation ofrubber sealing ring which is secured within the housing and is adaptedto have pressure abutment against the outer face of the rear anchorageplate.

Another feature, briefly referred to above, is the improved constructionand arrangement wherein numerous different types of solenoid carriersand plungers can be substituted in guiding ribs which are standardizedin each mounting housing, so that different carriers can be substitutedin the same or different housings. In this regard, a further featureresides in the provision of a numerical scale along one of the guideribs for cooperating with a data mark on the solenoid carrier forindicating when the solenoid carrier is at the same marking, or at somechosen different marking in the mounting housing. All of thecorresponding solenoid carriers have the same data marking, and all ofthe corresponding mounting housings have the same numerical scale forassuring identity of setting. This arrangement facilitates the assemblyof the bells in an assembly line operation, after the desired number onthe numerical scale has been chosen.

Another object is to provide a construction which can be readily openedfor inspection and repair.

Another object is to provide a construction which is simple andinexpensive, both with respect to cost of the parts and assembly of theparts.

Other objects, features and advantages of the invention will be apparentfrom the following detailed description of preferred embodimentsthereof.

In such embodiments:

FIGURE 1 is a front elevational view of an entire bell assembly, on areduced scale;

FIGURE 2 is a rear elevational view of the same, on the same reducedscale;

FIGURE 3 is a front elevational view of the mounting plate, on a largerscale, with the housing removed therefrom;

FIGURE 4 is a vertical sectional view of the mounting plate takenapproximately on the plane of the line 4-4 of FIGURE 3;

FIGURE 5 is a detail sectional view of one of the receptor terminalblocks on the mounting plate, taken on the plane of the line 5-5 ofFIGURE 3;

FIGURE 5A is a view similar to FIGURE 5, but showing one of the prongterminal blocks which are mounted on the housing;

FIGURE 6 is a rear elevational view of the housing viewed from the rearside, before the prong terminal blocks and the slidable solenoid andstriker unit have been assembled thereon;

FIGURE 7 is a fragmentary view of this same part of the housing, butwith the prong terminals and the solenoid and striker unit assembledthereon;

FIGURE 8 is a vertical diametrical sectional view through a completebell assembly of the vibratory alternating current permanent magnettype;

FIGURE 9 is a detail sectional view of the solenoid and plunger unit ofFIGURE 9, but on a larger scale of about twice that of FIGURE 8;

FIGURE 10 is a fragmentary sectional view, similar to FIGURE 9, butillustrating a single stroke bell, adapted for either direct currentoperation or alternating current operation;

FIGURE 11 is another view similar to FIGURE 9, but illustrating avibratory direct current make-and-break bell, wherein the bell makes andbreaks its own direct current circuit for continuous vibratoryoperation.

The entire bell assembly (FIGURE 8) comprises three main elements, towit; the front gong 20, the housing 21 and the mounting plate 22. Thegong is secured to the housing 21, the housing 21 is secured to themounting plate 22 and the mounting plate 22 is secured to any standardback box or to any suitable part of the building structure or otherappropriate support.

Referring first to the details of the mounting plate 22, this comprisesa circular disk-like stamping or die casting having a recessed webportion 24 (FIGURES 3 and 4) from which flares an inclined flange 26,and from which then projects a radially extending flange 27. The webportion 24 is provided with a plurality of perforations 29 to facilitatethe different placing of bolts or screws entering the back box or mainsupport, and also for providing mounting tabs for mounting the terminalblocks, as will be later described. The electrical conductors enterthrough a central hole 31 in the mounting plate 22 for connecting withthese terminal blocks. The top and bottom midpoints of the flange 27 areestablished on a diametrical arbitrary line XX which passes midwaybetween the vertical, parallel positioning of the two receptor terminalblocks 33, 33. At the top of the flange 27 is formed a safety hangerbracket 35 having notched-out ends 36. On the diametrically oppositeside of the flange 27 is cut a notch 38 for receiving a locking screwcarried by the housing. The manner in which the hanger tab 35 and notch38 cooperate in providing a safety hanger support for the housing willbe later described after the description of the housing.

Referring now to the receptor terminal blocks 33, these are of long,narrow form spaced equidistantly outwardly from the conductor hole 31and running parallel to the diametrical line X-X extending centrallythrough the hanger tab 35 and locking notch 38. These terminal blocks 33have slotted end lugs 41 into which extend crimping lugs 42 punched outof the web 24, and pressed firmly into the slotted lugs 41 (FIGUREPunching the crimping lugs 42 out of the web 24 leaves holes 40 in theweb into which fit downwardly projecting lugs 40' molded from the bottomof the insulating terminal block 33. Threaded sleeves 43 are insertedinto elevated portions of each block at the time the blocks are molded(FIG- URE 5 and terminal screws 44 thread into these threaded sleevesfor establishing electrical connection with the conductors entering thedevice. A metallic clip 46 is secured to threaded sleeve 43 by swedging,and is formed with forwardly and upwardly shaped terminal lips 47,between which the other prong terminal associated with the housing isadapted to enter.

Referring now to the housing 21, this is preferably formed of anonmagnetic material, and has the sectional configuration best shown inFIGURE 8. This housing 21 has an outer rim 51 from which extends aninwardly curved portion 52, which, in turn, joins with a cylindricalsocket 55 projecting forwardly into the bell 20, this socket having aflat bottom wall 57. This floor portion is formed with a threadedcentral boss 58 into which threads a bolt or screw 59 which serves tofasten the center of bell to the housing 21.

Referring now to the top hanger bracket mounting of the top of thehousing 21 to the top of the mounting plate 22, it will be seen fromFIGURE 8 that the outer flange 51 of the housing 21 has substantialwidth and depth. At the top central portion of this flange is formed anupwardly and forwardly extending arcuate slot 61 of a width justslightly more than the width or length of the interlocking lug 35 on themounting plate 22. The forward edge of the slot 61 has a slight slope 62in a forward direction to facilitate the movement of the slot 61 overthe hanger bracket 35 in the assembling operation. When the parts areproperly centered with the interlocking lug 35 uppermost, the housing 21can thereupon be drawn downwardly with the lug or tab 35 moving upwardlywithin the slot 61 formed in the top of the housing. This enables thelower part of the housing 21 to bring the lower part of flange 51 of thehousing over the lower peripheral portion of the mounting plate 27.Screwing upwardly through the bottom part of the flange 51 is aninterlocking screw 64 which is adapted to pass through the notch 38 whenthe housing is being swung to a closed position. This brings the screw64 into contact with or slightly beyond the peripheral flange 27,whereupon the screw 64 may be threaded upwardly to establish aninterlocking relation against the back side of the flange 27 forsecurely fastening the housing 21 to the mounting plate 22. Thismounting of the housing 21 on the mounting plate 22 prevents anypossibility of the housing and gong assembly from vibrating loose fromthe mounting plate 22. To vibrate loose, the hanger would have tovibrate in an upward direction, and the screw 64 prevents this. A rubbersealing ring is partially embedded in the outer flange 51 of the cover21 and is adapted to have sealing abutment against the front face offlange 27 of mounting plate 22. This substantially excludes rain, snowand the like from entering the interior of the bell housing through thejoint between the housing 21 and the mounting plate 22.

Referring now to the prong type of plug-in terminals 69, these aremounted in the socket for plug-in reception in the receptor terminals 33when the housing is swung into closed position around the interlockinglug 35 acting as a hinge. Each prong terminal is moulded into one end ofa relatively long narrow insulating block 73. Passing through the otherend of the block is a screw 74 which screws into a threaded hole 76 in asubstantially square lug 76' projecting up from the bottom wall of thesocket 55 for anchoring the terminal block. Parallel longitudinal lugs77 and a transverse end lug 78 extend upwardly from the bottom wall 57of the socket 55 and define a pocket for anchoring each terminal block.Locating the plug-in terminals at the bottom of the socket 55 places theouter ends of the plug-in terminals below the level of the top edge ofthe flange 51, where they will be protected from injury.

The solenoid striker unit is mounted for vertically adjustable slidingmovement in a vertical guideway 79 defined between upper and lower pairsof guide ribs 80 and 81 which project integrally upwardly from the floor57 of the socket 35 (see FIGURES 6 and 7). The solenoid unit can belocked in any desired shifted position by locking screws which will belater described. Of these guide ribs, the lower left-hand rib,designated 81', is made slightly wider than the others for receiving anumbered scale 83. Embossed, or otherwise marked, on this rib 81 is thenumbered scale 83 bearing numbers such as 1, 2, 3, etc. The lowerleft-hand corner 84 of the shiftable solenoid unit constitutes the dataor reference point which is read against the numbered scale 83, fordetermining the adjusted position of the solenoid unit. Between theupper guide ribs 81 is a lower bearing rib 86, and between the two lowerribs 81, 81 are two lower bearing ribs 87, each integral with the bottomwall 57. These bearing ribs 86 and 87 are formed slightly lower than theguide ribs 80 and 81, and afford a smooth slide surface constitutingpart of the vertical guideway 79 for slidably supporting the solenoidunit 70.

Referring now to the construction of this solenoid unit 70, it comprisesa solenoid coil 91 which is assembled in a solenoid frame 92. This frameis preferably in the form of a U-shaped stamping of magnetic metalcomprising a back bridging portion 93, from the top and bottom ends ofwhich extend parallel top and bottom leg portions 94 and 95 v(FIGURE 8).Bent at a right angle from the inner edge of the upper leg 94 is ananchoring flange 97 having parallel vertical slots 98 formed therein.Anchoring screws 99 pass through these slots and thread into tappedholes 102 in the bottom wall 57 of the socket 55. The slotted flange 97has sliding guided engagement between the upper guide ribs 80, and thelower flange 95 has sliding guided engagement between the lower guideribs 81; although this upper and lower relationship may be reversed, ifdesired. It will be understood that loosening of the anchoring screws 99will permit the upward or downward shifting of the solenoid operatingunit to any position desired. Flexible conductors 103 extend from thesides of the solenoid coil and have their ends soldered to the baseportions of the prong terminals 69, these flexible wires accommodatingthe aforesaid sliding movement of the solenoid operating unit.

Extending approximately halfway in the solenoid winding 92 is a guidetube 104 composed of a non-magnetic metal, such as beryllium copper, orthe like. This guide tube extends downwardly through a hole in lower leg95 and also through a hole 106 in the socket portion 55 of the housing21. Reciprocating freely in this guide tube 104 is a plunger 108comprising a magnetic upper portion 109 and a non-magnetic strikerportion 111, which is adapted to strike the bell 20. Coextensive withthe upper end of the non-magnetic guide sleeve 104 is a tubular magneticpole piece 114 having a depending lower sleeve 115 in which is inserteda compression spring 117. The lower end of this compression springencircles a centering pin 118 projecting upwardly from the plunger 108.Screwing into a threaded bore 119 in the upper end of the magnetic polepiece 114 is a non-magnetic brass screw 121 which holds the pole piecefixedly in position.

The lower end of the solenoid coil seats directly on the lower frame leg95 of the solenoid frame. Seating on the top surface of the solenoidwinding is a mangetic pole plate 123 which is preferably in the form ofa rectangular iron plate of high magnetic permeability. The retainingscrew 121 passes down through a central hole in this pole plate.

Interposed between this pole plate and the upper leg 94 of the solenoidframe is a powerful permanent magnet 125 preferably in the form of arectangular flat plate having approximately the perimeter dimensions ofthe pole plate 123. Although the body of this magnet may be composed ofAlnico, ceramic, plastic or other suitable materials, I preferablyconstruct the magnet of rubber permeated with magnetizable materials.The top portion of this magnet is of one magnetic polarity and thebottom portion is of the opposite polarity. Solely for facility ofdescription, let it be assumed that the top portion is of south polarityand the bottom portion is of north polarity. Under these conditions, thenorth pole flux from the bottom of the magnet will permeate the poleplate 123 and the pole bushing 114. Conversely, the south flux from theupper side of the permanent magnet will permeate the entire solenoidframe, including the top leg 94, bridging member 93 and also the bottomleg 95. Also, the magnetizable upper portion 109 of the reciprocatingplunger 108 will assume south pole magnetization because of itsproximity to the south pole flux in the lower leg 95 of the solenoidframe. The permanent magnet 125 is preliminarily magnetized either to orapproximately to the saturation point, prior to assembly in the bell.

Referring now to the operation of this embodiment, when the solenoidcoil is deenergized, the direction of the pull exerted on the plunger isin an upward direction, owing to the pull of the permanent magnet 125overcoming the weight of the plunger, the downward thrust of the spring117, etc. Thus, the plunger 108 is held in a neutral position betweencompression position and operated position. After an electricaloperation, the plunger will always return to this neutral position. Itwill be understood that the poles of the permanent magnet remainconstant, while the coil alternately reverses the poles on each /2 cycleof a sine wave. Let us assume that on the upward alternation of thecurrent, the solenoid coil and the permanent magnet combine theirmagnetic lines of force and aid each other in establishing a magneticpull. The combined magnetic lines of force from the coil and from thepermanent magnet increase the pull on the plunger and cause acompression of the compression spring 117 which pulls the plunger awayfrom the gong. On the next or downward alternation in the alternatingcurrent, the direction of plunger travel reverses when the solenoidenergizes on this /2 cycle. The solenoid coil reverses poles, and thecoil and permanent magnet then buck each other and cancel substantiallyall the magnetic lines of force. The sudden release of the plunger fromthe previous magnetic pull causes the compressed spring 117 to shoot theplunger against the gong with substantial impact.

In FIGURE 10, I have illustrated the substitution of a single strokestriker mechanism in the bell assembly, in lieu of the continuouslyvibrating striker mechanism just described. This single strokeembodiment is operable on either direct current or alternating current;and is operable when the bell is mounted at any angle; i.e. with theplunger reciprocating either vertically, horizontally or at anyintermediate angle. For facility of description, it will be assumed thatthe installation is vertical with the plunger being projected downwardlyto make its single stroke impact against the gong. In this embodiment,the upper end of the non-magnetic guide tube 104a projects substantiallyabove the upper leg 94 of the solenoid frame. This upper end is closedby crimping the end of the tube, and, if desired, a cushioning pad 127may be inserted in this closed end. The lower end of the guide tube alsoextends a substantial distance below the solenoid frame, and this endhas a slightly inwardly curved lip 128. The plunger 130 has a longrelatively thick body portion 131, and also has a slender gong strikingextension 132. The main body portion 131 is composed of iron or othermagnetically responsive material, and the gong striking extension 132 iscomposed of non-magnetic material. A shoulder 134 is defined at thejuncture between the thick and thin portions of the plunger. A longconically-shaped compression spring 135 has its small end abutting thisshoulder 134 and has its large end abutting the inwardly curved lip 128at the lower end of the guide tube. This spring has just enoughcompression strength to sustain the weight of the plunger so that theplunger is normally held in the elevated position shown. When thesolenoid is energized, the magnetic flux therefrom operates to draw themagnetic body portion 131 of the plunger down into a central positionwith respect to the solenoid coil, thereby causing the striker pin 132to move out of the guide tube and to strike the gong with a sharp impactblow. This gives the bell its single stroke operating characteristic.Obviously, when energized by direct current, the plunger remains in itsgong striking position; and when energized by alternating current, thefrequency of alternations exceeds the responsiveness of the relativelyheavy plunger, and, hence, the plunger remains in its single strokeposition in contact with the gong. In this single stroke embodiment, theentire solenoid striker unit can, of course, be adjusted to differentback or forth positions between the guide ribs 80, 81, etc. Also, insubstantially all other respects this single stroke embodimentcorresponds to the previously described embodiment, including the hangerbracket 35, the adjustability between the guide ribs 80-81, etc.

Referring now to the vibratory direct current embodiment which makes andbreaks its own circuit, this embodiment is best shown in FIGURE 11. Thesolenoid striker unit is very similar to the preceeding embodiments,having the same to-and-fro adjusting movement between the guide ribs80-81 in conjunction with the numerical scale 83. Mounted on the backbridging wall of the solenoid frame is an adjustable extension platewhich has adjusting slots 141 therein for receiving screws 142 whichthread down into tapped holes in the solenoid frame. This arrangement ofslots and screws enables the plate 140 to be adjusted for adjusting theposition of the direct current switch. Projecting from the plate 140 isan arm 145 having a forwardly bent mounting lug 146. Secured to the faceof this lug by screws 148, threading into the lug, is a smallmake-and-break switch 150, comparable to a micro switch. The enclosedcontacts are actuated by a thin flexible actuating arm 152 whichprojects from the switch housing into the path of the solenoid actuatedplunger 130. The two switch contacts of this switch are interposed inseries between one of the terminal prongs 69 and the adjacent end of thesolenoid winding. This plunger may be a substantial duplicate of theabovedescribed plunger shown in FIGURE 10. That is to say, it maycomprise the relatively thick magnetic portion, having the bell strikingnon-magnetic tip at its outer end,

'surrounded by a conically wound compression spring 135a, similar to thespring 135. Normally, this conical spring will maintain the plunger inthe retracted position shown, wherein the large end of the plunger bearsagainst the switch actuating arm 152 for holding the switch in closedposition. When energizing current is supplied to the bell assembly, theresulting energizaiton of the solenoid attracts the plunger outwardlyand causes its striker tip to strike the gong. This outward movement ofthe plunger opens the switch 150, thereby immediately de-energizing thesolenoid 92 so that the reaction of the plunger closes the switch again.This immediately sounds the bell again, which keeps on continuously aslong as current is supplied to the solenoid. Here again, this embodimenthas the hanger bracket 35, the adjustability between the guide ribs80-81, the side location of the terminal blocks 33, 69, etc.

It will be seen that in each of the embodiments shown, the solenoidwinding has its long dimension extending vertically so as to reduce thehorizontal width or breadth of this part of the assembly. Also, thelocation of the slotted anchoring flange 97 extending vertically, andthe vertical location of the slide guideway 79 between the guide ribs80, 81 under the solenoid frame, further reduce the breadth of theassembly. Moreover, the location of the permanent magnet on the verticalaxis of the solenoid reduces the horizontal dimension. Still further,the location of the terminal blocks 33 and 73 in close proximity to thesolenoid frame keeps the breadth down considerably in situations wherethis is desirable. This is desirable when mounting the smaller gongs onthe housing, such as the 4-inch or 6-inch bells. The relatively smalldiameter of the cup-shaped socket 55 enables this socket to be extendedinto or nested wthin the bowl curvature of a 4-inch gong, as clearlyshown in FIGURE 8.

Referring to FIGURES 10 and 11, I have shown the guide tube 104 or 104aas being provided with upper and lower stop lugs 155 and 156 which arepunched out of the body of the guide tube. The upper stop lug 155projects outwardly above the top leg portion 94 of the solenoid frame92, and the lower stop lug 156 projects outwardly below the lower legportion 95 of such frame. Thus, in each embodiment the guide tube isheld against upward or downward sliding movement within the solenoid andsolenoid frame. The guide tube is initially punched out of flat stock,at which time the stop lugs 155 and 156 are also punched out; followingwhich this flat blank is then curled into the cylindrical form shown.After insertion of the cylindrical guide tube through the solenoid andsolenoid frame, the lugs 155, 156 are thereupon sprung outwardly intothe positions shown. Removal of the tube is effected by merely bendingthe lugs back inwardly.

The large lettering and the prominence given to the word TOP at the topof the mounting plate 22 are imperative instructions that this part ofthe mounting plate must be located at the top. Such mounting guaranteesthat the housing and bell cannot be shaken loose and fall, with possibledamage to persons or articles situated below.

While I have illustrated and described what I regard to be the preferredembodiments of the invention, nevertheless, it will be understood thatsuch is merely exemplary, and that numerous modifications andrearrangements may be made therein without departing from the essence ofthe invention.

I claim:

1. In an electrical bell, the combination of a rear mounting plateadapted to be secured to a point of support, a hanger hook projectingupwardly from the upper portion of said mounting plate, a bowl-shapedhousing having an open rear side facing said mounting plate, a hangerslot in the upper portion of said housing adapted to fit down over saidhanger hook to afford a hinged hanger mounting of the housing at saidhanger slot permitting hinging movemcnt of the lower portion of saidhousing in an outward direction away from said mounting plate, saidhousing having a cup-shaped socket recessed into the bottom of its bowlshape, a pair of vertically extending guide ribs formed in said socket,a solenoid operating unit mounted for slidable adjusting movement alongsaid guide ribs, said solenoid operating unit comprising a solenoidwinding, a solenoid frame carrying said winding, a guide tube extendingaxially of said winding, a plunger reciprocably mounted in said guidetube and having an impinging end adapted to strike a gong, and attachingmeans for detachably mounting said gong on said housing wherebydifferent sizes of gongs can be substituted by said attaching means,each of said gongs substantially enveloping the major portion of saidhousmg.

2. The combination defined in claim 1 wherein a permanent magnet isassociated with said solenoid winding so as to have its flux interacttherewith.

3. The combination defined in claim 1 wherein a solenoid frame carriessaid solenoid winding, and wherein a planar form of permanent magnet iscarried by said frame at one end of said solenoid.

4. The combination defined in claim 1 wherein said mounting plate isprovided with a designation which designates the top of said mountingplate for insuring that such portion will be mounted uppermost.

5. The combination defined in claim 1 wherein said mounting plate andsaid housing are both provided with cooperating prong and receptorterminals extending parallel with and disposed in relatively closeproximity to said vertically extending guide ribs.

6. The combination defined in claim 1 wherein a compression spring insaid guide tube acts on said plunger to cause said bell to have singlestroke operation when energized.

7. The combination defined in claim 1 wherein a switch is maderesponsive to the reciprocation of said plunger to make and break thecircuit of said solenoid for producing a vibratory direct current hell.

8. The combination defined in claim 1 wherein an indicating scale isassociated with said solenoid operating unit for indicating the positionto which said solenoid operatng unit has been adjusted along said guideribs.

9. The combination defined in claim 1 wherein a hanger tongue projectsfrom the top portion of said mounting plate, and a hanger slot is formedin the top portion of said housing for receiving said hanger tongue.

10. The combination defined in claim 9 wherein a notch is formed in thelower portion of said mounting plate to clear a vertically extendingscrew threading upwardly through the bottom portion of said housing,whereby said screw when threaded upwardly upon the closing of saidhousing engages the backside of said mounting plate to hold the lowerportion of said housing against outward swinging movement.

11. The combination defined in claim 1 wherein a permanent magnet actson said plunger, and wherein a spring in said guide tube also acts onsaid plunger.

12. The combination defined in claim 1 wherein prong and receptorterminals are mounted on said rear mounting plate and on said housing,and wherein anchoring lugs are punched out of said rear mounting plateand are crimped over against one of said terminals to anchor it inplace.

13. The combination defined in claim 1 wherein a slotted anchoringflange extends from one end of said solenoid frame, and a screw passesthrough said slot and threads into a tapped hole in said housing betweensaid guide ribs to anchor said solenoid operating unit in any desiredposition of adjustment.

14. The combination defined in claim 1 wherein a pliable sealing gasketis secured to the rear face of said housing for establishing weathertight contact against the front face of said mounting plate.

9 15. The combination defined in claim 1 wherein a compression spring inthe upper portion of said guide tube normally tends to force saidplunger downwardly, a permanent magnet above said guide tube, and atubular magnetic pole piece.

16. The combination recited in claim 1 wherein said guide tube hasspaced stop lugs adapted to engage said solenoid frame to retain saidguide tube therein.

No references cited.

5 JOHN W. CALDWELL, Primary Examiner.

H. I. PITTS, Assistant Examiner.

